2/5:3/4=8:15
0.45:35=9:700
18:15=6:5
3/5:0.21=20:7
6/0.5=12:1
24:0.8=30:1
2/5:3/4=(2/5×20):(3/4×20)=8:150.45:35=45:3500=9:70018:15=(18÷3):(15÷3)=6:53/5:0.21=0.6:0.21=60:21=20:76/0.5=(6×2):(0.5×2)=12:124:0.8=240:8=30:1
求比值1/4:2/50.35:2/51/2:8.43.75:5051/8:1.2515:45
1/4:2/5=1/4÷2/5=5/80.35:2/5=0.35÷2/5=7/81/2:8.4=1/2÷8.4=5/843.75:505=3.75÷505=3/4041/8:1.25=1/8÷5/4=1/1015:45=15÷45=1/3